Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, truong thanh
tieu xanh » tieu danh, chieu xanh, dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
luan nang » luan van, van nang, luan san
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong ty
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - hanh tang luan nang ((cong dan) OR (((cong tan) OR (cong thanh)))) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - hanh tang luan nang ((cong dan) or (((cong tan) OR (cong thanh)))) toan cau~".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - hanh tang luan nang ((cong dan) or (((cong tan) OR (cong thanh)))) toan cau*.